Light sensitive silver halide materials containing yellow-forming couplers



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Filed Jan. 23, 1967 D- 29, 1970 MAKoTo YosHlDA EVAL LIGHT SENSITIVE SILVER HALIDE MATERIALS CONTAINING YELLOW-FORMING COUPLERS O ID A LISNEIG 'lVDlldO ozml. w Y oomI OOv 35:52u.. m ooo N Sl o O. "2 O AusNao wvoudoo INVENTORS MAKoTo YosHmA MoMoTosm TsuoA KAzuYA sANo YAsusm olsml t ATTORNEYS o o. 7 USNSG WVOLLOO United States Patent O Japan Filed Jan. 23, 1967, Ser. No. 611,000 Claims priority, appliactiorzr gapan, Jan. 21, 1966,

Int. cl. obst. 1/40 U-S. Cl. 96-100 10 Claims ABSTRACT F THE DISCLOSURE The novel yellow-forming coupler having a methyl group on the benzoyl nucleus of a benzoyl acetanilide represented by CH3 i has been found to have a high coupling reactivity and a sucient solubility in organic solvents as Well as to give a yellow image of excellent fastness and a spectral absorption suitable for color photography.

BACKGROUND OF THE INVENTION The following three methods have been hitherto known to incorporate a nondilusing coupler in a photographic emulsion layer:

(1) Water-solution method; the neutral or alkaline aqueous solution of the coupler having the Watersolubilizing group such as carboxyl group or sulfonic acid group, is added into the emulsion and the mixture neutralized with an acid, if needed.

(2) Oil-solution method; the coupler is dissolved in an organic solvent, dispersed into an aqueous medium to iine colloidal particles and then the dispersion is added into the emulsion.

(3) The melted coupler is added directly into the emulsion or aqueous medium.

In order to make up an excellent blue sensitive emulsion layer by use of a yellow-forming coupler of the oilsolution type, it is necessary that the coupler have a high coupling reactivity with the exidation product of developing agent such as p-phenylene-diamines; that the yellow dye formed by color development have a light absorption suitable for the color reproduction; that the image of yellow dye can be stored without fading or deterioration even under severe conditions; and that the coupler have no bad inuence upon the photographic emulsion. Furthermore the coupler must be easily dissolved in the organic medium used and must not crystallize during storage.

Since the commonly used coupler of the oil-solution type does not have high coupling reactivities against the exidation product of a developing agent in the dispersed state in the emulsion layer, a blue sensitive emulsion layer having excellent photographic characteristics has been diicultly obtained in such type. The change in the chemical structure of a yellow-forming coupler (such as a substituted benzoyl-acetanilide) as would impart high coupling reactivity to it, tends to shift the spectral absorption of the resulting yellow dye to the longer wave length, causing an increase in the absorption of unfavorable green light. That is to say, it has been believed that a general ice inconsistent correlationship exists between the desired light absorption of a yellow-forming coupler and its coupling reactivity.

In the lield of color photography, therefore, a number of efforts have been made to obtain a yellow-forming coupler, having a high coupling reactivity and giving a yellow image without .green absorption.

SUMMARY OF THE INVENTION This invention relates to light sensitive materials having one or more emulsion layers containing dye-forming couplers and more particularly, it is concerned with the light sensitive materials wherein the novel yellow coupler is incorporated.

DESCRIPTION OF THE DRAWINGS FIG. 1 relates to Example l and illustrates the spectral absorption curve of yellow image (Curve A) and that of another lm provided and processed similarly using corresponding coupler having no CH3 radical in benzene ring (Curve B).

FIG. 2 relates to Example 4 and illustrates the spectral absorption curve;

FIG. 3 relates to Example 6 and illustrates the spectral absorption curve; and

FIG. 4 relates to Example 12 and illustrates the spectral absorption curve.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In accordance *with the present invention, there is provided a light sensitive material for color photography, containing at least one of the yellow-forming couplers represented by the general formula,

oooa @ooomoo CH3 lli (I) eline 0R' @cosmo ONE-Q CH3 )li (H) in which X is selected from the class consisting of alkoxyl group having l to 3 carbon atoms and halogen atom; R is selected from the class consisting of aliphatic residual group having at least one ether bond, branched alkyl group and straight chain alkyl group each having 8 to 20 carbon atoms, and -COR is an acyl group having 9 to 28 carbon atoms.

The above mentioned novel coupler used in this invention has a high coupling reactivity as well as a sufcient solubility in organic solvents, and it gives a yellow image of excellent fastness and spectral absorption suitable for color reproduction. The color photographic material produced by the use of this novel coupler is therefore characterized by good photographic properties, good color reproductivity, sufficient stability after the processings and ease of the production thereof. Such merits will be hereinafter illustrated in detail with other merits of this invention.

The new couplers of this invention, represented by the general Formulas I and II exhibit a similar or even higher coupling reactivity in comparison with the known couplers having the highest coupling reactivity as are represented by the following general Formulas III and 1V. In addition the dyes formed from them exhibit much less green absorption undesirable from the standpoint of color 4 reproduction of the subtractive process. Thus, a less red- (b) In the case or" (a), a relatively water-insoluble, low dish, sharp yellow can be obtained. boiling solvent is used, which is to be removed oir during the later steps. Ethyl acetate and cyclohexanone are used C H as such a solvent. ,Mx I (c) In the case of (a), a water-miscible organic solvent MCOCHUONHM is used, which may be removed olf during the later steps Or rnay be retained in a photographic material. Illus- X (u1) trative of such organic solvent are dimethylformamide,

dimethyl sulfoxide, N-methylpyrrolidone and glycerine. NHCOR' 10 (d) Heating and melting the coupler without using an organic solvent, and dispersing the thus melted coupler COCHONH in an emulsion or aqueous medium directly. This is Cil v suitable for the coupler melting at less than 85 C. (n) In some case, the organic solvents as given in (a), (b) and (c) may be mixed to obtain a good dispersion of In each of these formulas, X, R and COR' have the same the coupler.

meaning in the general Formulas I and 1I. Therefore, In order to make up a blue sensitive photographic the color photographic material of this invention, using emulsion layer having excellent properties, it does not the novel coupler, gives a high blue sensitivity, high matter whether only one of the couplers represented by yellow density and good gradation, while giving a less the general Formulas I and Il are used or two or more reddish, sharp hue. of them are used, or whether a yellow-forming coupler The coupler of this invention is markedly soluble in not represented by the general Formulas I and II are an organic medium for emulsifying and dispersing it in jointly used. As occasion demands, a yellow-forming emulsion. This property is shown in Table 1 with comcoupler of water-soluble type may be jointly used in the parison with the known coupler. same emulsion layer.

TABLEl Solubility Structure of coupler (25 C.) wt. percent/solu- Position MJ?. tion (ethyl General formula of CH3 X R or COR C.) acetate) 50-52 More than 50. lwonnuona B 97-99 6.3

COCHZCHzN-COCHHM 97-98 Merethen 32. 111-112 9. 3. CH 10o-101 4. s.

It is made possible by the use of the novel couplers When a small amount of the coupler of this invention of the general Formulas I and II each having a low is used together with a cyanor magenta-forming-coupler melting point and high solubility to reduce the quantity in the same emulsion layer, the color reproductivity can of a solvent to be used and to disperse the coupler more be improved, as disclosed in Japanese patent publication finely in an aqueous medium. The use of the coupler N0. 391/1965. which melts at less than 85 C., moreover, makes it The coupler of this invention can be satisfactorily appossible to melt and then disperse the coupler directly plied to various color photographic materials, for exin an aqueous medium `without using an organic solvent, ample, color printing paper, color positive film, color and the stability of the tine colloidal particles of the negative tilm and color reversal lm. coupler can be improved. Such reduction of the quantity Our invention is applicable not only to color photoof a solvent for dispersion will apparently result in simgraphic materials of the so-called multi-layer type -where plifying of the steps of producing a light sensitive matetwo or more emulsion layers each containing spectrally rial, increasing of the sharpness of an image by decreassensitized silver halide and the corresponding nondiiusing the thickness of a light sensitive layer, and shortening ing coupler are superposed on one support, but also to of the time for development. the so-called mixed grain type material Where two or The above mentioned effects and merits concerning more kinds of fine grains each containing spectrally senthe light absorption and solubility, obtained by intrositized silver halide and the corresponding nondiiusing ducing the methyl group into the benzoyl nucleus, are coupler are mixed and coated on one support. more strengthened in a case where the methyl group is The yellow-forming coupler of this invention has been introduced at the ortho-position to the carbonyl group. represented by the foregoing general Formula I or Il, That is to say, the compound having methyl group at the in which R of I is an aliphatic radical having at least ortho-position of the benzoyl nucleus in the general For- ODC ether bOHd, branched 01 Straight Chain alkyl eOUP mula I or II has more excellent properties as a coup1er 60 and these groups have 8-20 carbon atoms, and COR' to be used in this invention. of II is an acyl group of 9-28 carbon atoms. Those Furthermore, a yellow image obtained from the novel Carrying less than the lower limit carbon atoms partly coupler of this invention is so fast that it fades to much gO HO 'Elle alkaline deVelOPlUg Solution and dlfUSe HO less extent even after a long preservation, other layers, resulting in worsening of the color repro- To the incorporation of the coupler of this invention ductivity, since the aggregation force within the coupler into a photographic emulsion, various procedures can be mOleCUleS 0r between the Coupler molecule and Solvent satisfactorily applied, typical of which are the following; molecule is insuiiicient. 'On the other hand, when the (a) Dissolving the coupler in a less water-soluble, less Humber 0f Carbon a'fOmS eXCeCdS lll@ Upper limit in CaCll volatile organic solvent (B.P., more than 200 C.) and case, the blue extinction per weight (i.e., volume) of the dispersing the coupler solution directly in a photographic 7() yellOW dye formed bCOmeS unfavollfably C00 Small fOr emulsion, or digpersing previously the Sam@ in an aqueous the CmUlSiOIl layer l0 keep the blue density Sufficient Withmedium and then adding the dispersion to a photographic Out lflCfeaSlHg the lhlCkTleSS 0f the emUlSlOH layeremulsion. Di-n-butyl phthalate, tricresyl phosphate and The typical CXamPleS 0f the COUPlefS 0f llS lIlVeIlliOll NN-diethylgaproic acid amide are examples 0f such 01- af aS fOllOWS, but the iIlVCl'liOIl iS llOll '[0 bib limited ganic solvents. thereby.

1. C O O CrzHzs 0 0000-@ I CH3 (|31 2. (IJ 0 0 CuHzu @-0 0 000-@ I CH3 CI 3. (I) O 0 CmHas OHN-@ CH3 l 4. (I3 O 0 CloHzl @00 O0000-@ I CH3 C1 5. (Il O O C 12H25 CH3 F 6. IOOCH2ICHC4H9 C2H5 C O CHZC OHN I CH3 C1 7. (l) O O ClzHzs -oooH2CoHN-Q CH3 O CH3 8. (I3 O O CuHzn @-0 0 00N-@ I I CH3 O 02H5 NHCOCH2 O- Ii-CsHll t-C5H1l l co oH2ooHN l Cl NHCOCHzCHzN ITHO como-@A435115 o o orne ORN-Q O CH3 g so -I o-I E C O ClsHsi l oo outcome@ 15. CO O CrzHzs @-0 0 00N-@ I 5 CH3 C1 16. (l) O O C1zH25 @-0 0 00N-@ I I CH. oon,

17. C 0 O C12H25 CH3-@w o CH2@ omi-Q I 18. CO C 15H31 IlHCOCHzCHzN C H CH3-@oo CH2@ only-Q 4 19. lIH C O CrsHm I CH3 O CH3 20. NHC O CuHss CH3 (I) CH3 Examples of synthesizing some of these couplers will 3) now be given.

SYNTHESIS EXAMPLE Q (l-a) Dodecyl-3-amino-4-chlorobenzoic acid In a 1000 ml. 4necked flask equipped with a stirrer, thermometer, nitrogen gas feed conduit and byproduced methanol discharge pipe Were placed 185.5 g. of methyl- 3-amino-4-chlorobenzoic acid (1 mol) and 279 g. of n-dodecyl alcohol (1.5 mols). The mixture was dissolved by heating at 80 C. with stirring, and then there were introduced 2.5 ml. of titanium butoxide and nitrogen gas to distill off methanol byproduced. When the heating was further continued to keep the internal temperature at 170-180 C., ythe ester exchange reaction gradually advanced and methanol started distilling olf, about 80% of the theoretical amount methanol being distilled off within about 4 hours. Cooling the mixture gradually to the internal temperature of -50 C., it was Withdrawn and added to 1000 ml. of methanol. After standing for one night, a brown crystal was obtained. It Was liltered with suction, washed with 500 ml. of methanol and dried. It Was then recrystallized by the use of 1500 ml. of methanol to give 285 g. of the object product melting at 60-62 C. n 79% yield.

( l-b) Z-methylbenzoylaceto- (ZK-chloro-S-dodecyloxycarbonyl) anilide (structural Formula l) In a 1000 ml. 3-necked ask equipped with a stirrer, thermometer and exhaust pipe of byproduced ethanol were placed 136 g. of acetol ethyl-o-methyl-benzoate 65 (B P. 0105-107" C./1.5 mm. Hg) (0.66 mol) and 224 g.

of dodecyl-3-amino-4-chlorobenzoic acid (0.66 mol) obtained in (1-a). When the content was heated with stirring at 140-150 C., ethanol started distilling o and about 60% of the theoretical amount ethanol was distilled 70 off within about 4 hours. Stirri-ng was stopped and ethanol was further distilled oif under reduced pressure for 30 minutes. Cooling the reaction mixture gradually, it was withdrawn and added to 2500 ml. of petroleum ether.

After standing for one night, a yellow-White crystal Was deposited therefrom. It was iltered with suction, Washed with 1000 ml. of petroleum ether and recrystallized from 1000 ml. of ligroin to give 156 g. of a white crystal melting at 68 C. in 47.2% yield.

SYNTHESIS EXAMPLE 2 4-methoxybenzoic acid, in place of dodecyl-3-amino-4--' chlorobenzoic acid. The resulting oil Was treated with acetonitrile to be crystallized, and successively recrystallized from acetonitrile to give a white crystal. Yield: 42% M.P. 50-52 C. I

l. A (2 2;)1Dodecylt3-anin-o Llainethoxlybenzoic acil SYNTHESIS EXAMPLE crys a was o aine in e simi ar manner o synthesis Example 1 a except that methy1 3 amin0 4 meth 4-methylbenzoylaceto-(2-chloro-5dodecy1oxycarbonyl) oxybenzoic acid was used in place of methyl-3-amino-4- amhde (Structural Formula 17) chlorobenzoic acid, and recrystallized from methanol to In synthesis Example 1 b, acetol ethyl-p-methylbenzoyield the object product melting at 47-48 C. in 81% ate (B.P. 12S-129 C./2 mm. Hg) was used in place of4 yield. acetol ethyl-o-methylbenzoate. The resulting crystal was (z b) z methylbenzoylaceto (z methoxy 5 dodecyloxy recrystallized from acetonitrile to obtain'a white crystal.

carbonyl)anilide (structural Formula 7) 2 Yield: 60%.M'P' 1.24425 i 1D The melting point and nitrogen analysis are illustrated In the Synfhesl Example lb dodecy13am1n0'4' below concerning the typical couplers of this invention; methoxybenzoic acid was used 1n place of dodecyl-3- amino-4-chlorobenzoic acid. The resulting crystal was recrystallized from acetonitrile to obtain a white crystal melting at 46w48 C. in 43% yield. 20

SYNTHESIS EXAMPLE 3 2-methylbenzolyacet0-(2-chloro-5-(2,4-di-t-amyl- I GOOR phenoxy-acetomido) anilide (structural Formula 9.) r G COCHZCOHN In a 100 ml. 3-necked flask equipped with a stirrer, 20 C H\`l. 2 I dropping funnel and cooler were placed g. of 2- 3 X methylbenzoylaceto-(3-chloro-5-amino)anlide, 20 g. of l triethylamine and 300 ml. of acetone, to which 52 yg. of II NHCOR 2,4-di-t-amylphenoxyacetyl chloride was then added drop- 5 6 wise at room temperature with stirring. After the stirring 30 43 2 COCH2C0NH of about 30 minutes, about 150 ml. of the acetone was CH3 l distilled olf and the residual solution was poured in ice X Structural Position N-analysis General formula of CH3 formula No. radical X R R M.P. C. Calcd. found i 2 -Ci -CizHi 68 2. so 2. 68 2 2 -Cl -Ci4H2u 69-70 2. 66 2. 55 3 2 -Cl -CicHaa 71 2. 52 2. 80 I 7 2 -OCHa -CizHrn 46-48 2. 83 2. 83 i5 3 -oi -CiiiHis 8i 2. so 2. 83 16 3 -OCHa -C12H25 50-52 2. 83 3. 07 17 4 -Cl -CizHzs 124-125 2. 80 2. 62

erizo-@A061111 t-iNii n 9 2 -Ci -orrzCHzN-CHv 137 4. s6 4.86 1i 2 -oi 000151351 iis-9o 6.29 6. 21

CHQOHzN-Cdo COCisHai water. The resulting crystal was iiltered, washed with wa- The following examples are given in order to illustrate ter, dried and recrystalized from ethanol to obtain 52 g. 55 the embodiments of this invention. (55% yield) of a white crystal melting at 137 C. Example 1 SYNTHESIS EXAMPLE 4 15 g. of the coupler (l) and 20 g. of di-n-butyl phthal- 2-methylbenzoylaceto-(2-chloro 5 (3(N-butyl-hexadecate were heated at 60 C. to prepare a coupler solution, aneamide) propion amido)anilide (structural For- 60 which was then added t0 300 ml. of an aqueous solution mula 11) containing 25 g'. of gelatin and 1.0 g. of sodium dodecylbenzenesulfonate at C. and vigorously stirred for 30 lhegdgsimrleinaml) alo (eliutin minutes by means of a homogenizer. The coupler and p L.) di-n-butyl phthalate were finely emulsiied. All the emulplace of dodecyl-3-ammo-4-chlorobenzoic acid. The resied dispersion was mixed with 500 g. of a photographic sultinor oil was treated with acetonitrile to be crystallized o emulsion containing 45 g. of silver iodobromide and 50i g. and recrystallized from methanol to give a white crystal, l. h h 0 l f 3,7 1 f the Object compound Yieid: 85% M.P. sis-99 C. of. ge mi e W '3 m o a 0 acetone S0 non 0 triethylene phosphoramide as a'hardener, and after the pH SYNTHESIS EXAMPLE 5 being adjusted to 7.0, applied to a film base of cellulose l triacetate to be 8.0X10-1 cm. thick on dry base. 3`methy1benzoyl-a-ceto'(Z'methoxy''dodecyloxycar The resulting lm was exposed and processed accorti'-l bonynamhde (Structural Folmula 16) ing to the following procedures to obtain a sharp vyellow In synthesis Example 1 b, acetol ethyl-m-methylbenimage. The spectral absorption curve of the yellow image zoate (B.P. 11S-120 C./3 mm. Hg) was used in place formed was shown by Curve A of FIG. 1. Similarly, of acetol ethyLo-methylbenzoate, and dodecyl-3-arnino- 75 Curve B of FIG. 1 was that of another lilm provided and processed similarly but using the corresponding coupler having no CH3 radical in the benzene ring,

l C1 (Coupler a) The coupler (1) gave a less reddish and sharper yellow than the coupler (a).

(II) Color developing solution (pH=l0.5)

Water- 1000 ml. 4-arnino-3-methyl N,N diethylaniline hydroxide- Sodium sulte (anhydrous)-l g. Sodium carbonate (monohydrate)-47 g. Potassium bromide-2 g.

(lll) Fixing solution (pH=4.5)

Water-1000 Inl. Hypo (hexahydrate)-8O g. Sodium sulte (anhydrous)-5 g. Borax-6 g. Acetic acid-4 ml. Potassium alum-7 g.

(lV) Bleaching bath (pH=7.2)

Water-1000 ml. Potassium ferricyanide boric acid-10 g. Borax-5 g.

EXAMPLE 2 l5 g. of the coupler (l) was heated and melted at 80 C., added to 250 ml. of an aqueous solution containing 30 g. of gelatin and 1.5 g. of sodium dodecylbenzenesulfonate at 75 C. and the mixture wasthen iinely dispersed by means of a colloid mill previously heated to above 80 C. by hot water.

All the coupler emulsion was added to 500 g. of an emulsion and applied to a lilm base similarly to Example l. The resulting lm was exposed and developed similarly to Example l to give a sharp yellow image.

EXAMPLE 3 g. of the coupler (1) was added to 25 ml. of ethyl acetate and dissolved therein with heating. The resulting solution was added to 250 ml. of an aqueous solution containing 30 g. of gelatin and 1.5 g. of sodium dodecylbenzenesulfonate, vigorously mechanically stirred in a homoblender and emulsiiied within minutes.

All of the so obtained coupler emulsion was added to 300 g. of a photographic emulsion containing 30 g. of silver chlorobromide and 50 g. of gelatin, to which 2O ml. of a 3% acetone solution of triethylene phosphoramide as a hardening agent was then added, and the pH was adjusted. The resulting emulsion was superposed as a fourth layer on a multi-layer lm having a red sensitive emulsion containing the coupler (b) as a iirst layer, green sensitive emulsion containing the coupler (c) as a second layer and yellow colloidal silver as a third layer, and dried to provide a positive lm for color photography.

(Coupler (b)) -S OsNa (Coupler (b)) When the ilm was subjected to stepwise exposure to blue light by the use of a sensitometer and to the developing treatments similar to Example 1, a sharp yellow image was obtained having a maximum density, gradation and sensitivity such as being required for color positive films.

EXAMPLE 4 5 g. of coupler (7) and 5 g. of di-n-butyl phthalate were heated at 60 C. to prepare a solution, which was then added to 50 ml. of an aqueous solution containing 5 g. of gelatin and 0.3 g. of sodium dodecylbenzenesulfonate and vigorously stirred by means of a high velocity agitator.

All the resulting coupler emulsion was added to 200 g. of a photographic emulsion containing 15 g. of silver iodobromide and 20 g. of gelatin, to which 10 ml. of a 3% acetone solution of triethylene phosphoramide was then added as a hardener, and applied to a lm base of cellulose triacetate, followed by drying.

The so obtained film was subjected to stepwise exposure by the use of a sensitometer, developed at 24 C. for 6 minutes by the following developing solution and rinsed with water at the same temperature. Then, it was exposed uniformly to white light and color developed as described in Example 1. The thus processed film gave a clear yellow image having such a maximum density, gradation and sensitivity as required for color reversal films. The spectral absorption curve of the resulting color image was shown in FIG. 2.

(V) Black-and-white developing solution (pH- 10.8)

Water-1000 ml. Metol-l g. Hydroquinone-3 g. Sodium sulte (anhydrous)-5O g. Sodium carbonate (monohydrate)-25 g. Potassium rhodanate-3-6 g. Potassium bromide- 2 g.

EXAMPLE 5 The following two lms were subjected to developing treatments similar to Example l.

(A) Film of Example l.

(B) To 500 g. of a photographic emulsion containing 45 g. of silver iodobromide and 50 g. of gelatin were added a solution of the coupler (d) represented below, 15 g. of the coupler being dissolved in 15 ml. of methanol, 50 ml. of l N caustic soda solution and 100 ml. of distilled water, ml. of a 3% saponin solution, 10% citric acid solution in an amount sufficient to adjust the pH of the emulsion to 6.5 and 200 ml. of water with stirring, and the resulting emulsion was applied to a film base of cellulose triacetate, followed by drying.

These two iilms A, B were allowed to stand in an air CENT, RATIO OF LOWERING OF COLOR DENSITY) Time (day) pier 5 10 20 It is evident from the fact that the color image obtained from the coupler (1) is more stable and more fast to heat and humidity than that obtained from the coupler (d).

COOH

l CUHMOONHQ-o O OHZO ONE-Q C O OH (Coupler (d)) EXAMPLE 6 3 g. of coupler (9) was dissolved in 1.5 ml. of tricresyl phosphate and 6 ml. of Cyclohexanone with heating. The hot solution of the coupler was added to 50 ml. of a 10% aqueous gelatin solution containing 0.3 g. of sodium higher alkylnaphthalenesulfonate and nely dispersed by a strong mechanical stirring.

The thus resulting coupler dispersion was added tO 140 g. of a blue sensitive photographic emulsion containing 7.8 g. of silver chlorobromide and 9.0 g. of gelatin, to which 5 ml. of a 3% acetone solution of triethylene phosphoramide was then added as a hardener, and the emulsion was applied to a film base of cellulose triacetate to be 6X 10-4 cm. thick on dry base, followed by drying.

When the film was subjected to stepwise exposure by the use of a sensitometer and processed as described in Example 1, a color image was obtained having such a maximum density, gradation and sensitivity as being required for color positive iilrns (see FIG. 3).

EXAMPLE 7 5 g. of the coupler `(l) and 5 g. of the coupler (7) were heated with 5 g. of di-n-butyl phthalate to prepare a hot solution. The resulting hot solution of the couplers was added to 100 ml. of a 10% aqueous gelatin solution containing 0.5 g. of sodium higher alkylnaphthalenesulfonate and the mixture was vigorously mechanically stirred in a homogenizer, thereby to disperse iinely the couplers and phthalate in gelatin.

All the coupler dispersion was added to 540 g. of a blue sensitive photographic emulsion containing 30 g. of silver chlorobromide and 35 g. of gelatin, to which 30 ml. of 3% acetone solution of triethylene phosphoramide as a hardener and 7 g. of polyvinylpyrrolidone were then added, and the resulting emulsion was applied to a baryta paper for the printing paper as a first layer to be L10X10i cm. thick on dry base. successively, a green sensitive emulsion containing a dispersion of the following coupler (e) was superposed thereon as a second layer,

(Coupler (e)) and a red sensitive emulsion containing a dispersion of the coupler (f), as a third layer, followed by drying.

(IMEI Q-CONHCIBHW (Coupler (f)) The so obtained printing paper for color photography was subjected to stepwise exposure to blue light by means of a sensitometer and then processed similarly to Example l except that it was developed at 20 C. for 12 minutes by the use of the following developing solution.

(VI) Color developing solution B Water-1000 ml. N-hydroxyethyl-N-ethylp-phenylenediamine sulfate-4.5 g. Potassium carbonate-75 g. Potassium bromide-2.5 g. Sodium suliite anhydrous)-2 g. Potassium phosphate (tribasic)-10I g. Hydroxylamine hydrochloride--2 g.

A clear yellow image obtained exhibited such a maximum density, gradation and sensitivity as being required for color printing papers. When the printing paper was exposed through a color negative film and developed Ias mentioned above, a clear color print was obtained.

EXAMPLE 8 10 g. of the coupler (3) and 5 g. of di-n-butyl phthalate were heated to prepare a solution. The resulting hot solution of the coupler was added to Inl. of a 10% aqueous gelatin solution containing 1.0 g. of sodium higher alkylnaphthalenesulfonate and vigorously mechanically stirred in a homoblender thereby tO disperse finely the coupler and phthalate in gelatin.

All the coupler dispersions was added to 500 g. of a blue sensitive photographic emulsion containing 26.6 g. of silver iodobromide and 40 g. of gelatin, to which 100 ml. of a 3% acetone solution of triethylene phosphoramide was then added as a hardening agent, and coated on a film base of cellulose triacetate to be 4.0 microns in thickness on dry base, followed Iby drying.

The resulting film was subjected to stepwise exposure to blue light by means of a sensitometer and processed in the similar manner to Example l except that it was developed at 20 C. for 15 minutes by the use of the color developing solution (B).

A yellow image obtained exhibited such a maximum density, grad-ation and sensitivity as required for color negative iilms.

EXAMPLE 9 The following two films were exposed and developed similarly to Example l.

|(A) Film of Example 6.

(B) A light sensitive film was prepared in the similar manner to Example 6 except that in place of the coupler dispersion, a solution of 3.2 g. of the coupler (d) dissolved in 3.2 ml. of methanol, 10.7 ml. of 1 N caustic soda solution land 21 ml. of distilled lwater was added and then neutralized with citric acid to pH 6.5.

The developed two color films were exposed to a very strong light from a xenon lamp for 20 hours respectively Initial density Coupler 1. 0 2. 0

Film:

A 3 25 15 B d 65 45 As evident from the results, the iilm using the coupler (3) of this invention gave a less degree of fading due to 13 light than the film using the known coupler (d), the former being more fast to light than. the latter.

EXAMPLE g. of the coupler (15 20 g. of di-n-butyl phthalate and 30 ml. of cyclohexanone were heated at 60 C. to prepare a hot solution, which was then added to 300 Inl. of an aqueous solution containing 25 g. of gelatin and 1 g. of sodium dodecylbenzen-sulfonate at 60 C. and vigorously mechanically stirred in a homogenizer for 30 minutes. The coupler was nely emulsied with the solvent.

All the emulsiied dispersion was mixed with 500 g. of a photographic emulsion containing 45 g. of silver iodo bromide and 50 g. of gelatin, to which 30 ml. of a 3% of triethylene phosphoramide was then added as a harden er, and after the pH adjusted to 7.0, the resulting emulsion was applied to a lilm base of cellulose triacetate to be 8.0X10-4 crn. thick on dry base. The film was exposed and processed as in Example 1 to give a clear yellow image.

EXAMPLE 11 A sharp yellow image was obtained in the similar manner to Example 10 except that the coupler (17) was used in place of the coupler (15) used in Example 10.

EXAMPLE l2 15 g. of the coupler :(18), 20 g. of di-n-butyl phthalate and 30 ml. of ethyl acetate were heated to prepare a solution, which was then added to 300 ml. of an aqueous solution containing 25 g. of gelatin and 1 g. of sodium dodecylbenzenesulfonate :and Ivigorously mechanically stirred for 30 minutes by means of a homogenizer. The coupler was iinely emulsiied with the solvent.

All the emulsied dispersion was mixed with 500 g. of photographic emulsion containing 45 g. of silver iodobromide and 50 g. of gelatin, to which 30 rnl. of a 3% aqueous solution of triethylene phosphoramide Was then added as a hardening agent, and after the pH being adjusted to 7.0, the resulting emulsion was applied to a lm base of cellulose triacetate to be 8.0 104 cm. thick on dry base.

The thus resulting iilm was exposed and processed as in Example 1 to obtain a sharp yellow image. The spectral absorption curve of the yellow image color formed was shown in FIG. 4.

EXAMPLE 13 The coupler (1l) Was dispersed to an emulsion and applied to a iilmbase as in Example 12.

The resulting lm was exposed and processed as described in Example 1 to give a less reddish clear yellow image.

We claim:

1. A light-sensitive material for color photography, comprising a support bearing thereon a silver halide emulsion layer containing at least one yellow-forming coupler represented by the general formula COOR @-0 o omo ONE@ ona i:

wherein X represents a member selected from the group consisting of a halogen atom and a lower alkoxy group of 1-3 carbon atoms, and 1R represents a radical containing 8 to 20 carbon atoms which is selected from the group consisting of an alkyl group and a radical represented by the formula in which R' represents an alkyl group, m and n each is an integer of from 2 to 5 inclusive, and p is an integer of from l to 2 inclusive.

2. A light-sensitive material for color photography comprising a support bearing thereon a silver halide emulsion layer containing a yellow-forming coupler selected from the group consisting of a-2metl1ylbenzoylaceto2 halo-5'-alkoxycarbonylanilide and a-2 methylbenzoylaceto-2'(lower alkoxy) 5' alkoxycarbonylanilide, in which said alkoxycarbonyl group contains 9 to 21 carbon atoms.

3. A light-sensitive material for color photography comprising a support bearing thereon a silver halide emulsion layer containing at least one yellow-forming coupler represented by the general formula CH3 X wherein X represents a member selected from the group consisting of a halogen atom and a lower alkoxy group of 1-3 carbon atoms and -COR represents an acyl group containing 9 to 28 carbon atoms.

4. A light-sensitive material for color photography comprising a support bearing thereon a silver halide emulsion layer containing a yellow-forming coupler selected from the group consisting of 111-2-methylbenzoylaceto-Z- 2(lower alkoxy) 5 acylaminoanilide, in which said acylamino group contains 9 to 28 carbon atoms.

5. A light-sensitive material as claimed in claim 2, in which said yellow-forming coupler is a-2-methylbenzoylaceto-2'-chloro-5dodecyloxycarbonylanilide.

6. A light-sensitive material as claimed in claim 2, in which said yellow-forming coupler is a-Z-methylbenzoylaceto-2methoxy5'-dodecyloxycarbonylanilide.

7. A light-sensitive material as claimed in claim 1, in which said yellow-forming coupler is a-S-methylbenzoylaceto-2'methoxy5-dodecyloxycarbonylanilide.

8. A light-sensitive material as claimed in claim 1, in which said yellow-forming coupler is a-4-methylbenzoylaceto-2chloro-5dodecyloxycarbonylanilide.

9. A light-sensitive material as claimed in claim 4, in which said yellow-forming coupler is a-2-methylbenzoylaceto 2' chloro-5-[3"-(N-n-butylhexadecaneamido) propionamido-anilide.

10. A light-sensitive material as claimed in claim 4, in which said yellow-forming coupler is a-2-methylbenzoylaceto 2 chloro-5'-(2",4"di-tert-amylphenoxyacetamido)anilide.

References Cited UNITED STATES PATENTS 2,407,210 9/ 1946 Weissberger et al. 96--100 3,409,439 11/ 1968 Yoshida et al. 96-100 OTHER REFERENCES Brown et al., Journal American Chemical Society, vol. 79. pp. 2919-27, (1957).

I. TRAVIS BROWN, Primary Examiner U.S. Cl. X.R. 96-55, 74 

